scholarly journals The effect of mangrove restoration on avian assemblages of a coastal lagoon in southern Mexico

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7493 ◽  
Author(s):  
Julio Cesar Canales-Delgadillo ◽  
Rosela Perez-Ceballos ◽  
Mario Arturo Zaldivar-Jimenez ◽  
Martin Merino-Ibarra ◽  
Gabriela Cardoza ◽  
...  
Keyword(s):  
Relative Abundance ◽  
Mangrove Forest ◽  
Linear Models ◽  
Bird Species ◽  
Mangrove Forests ◽  
Avian Communities ◽  
Southern Mexico ◽  
Mangrove Restoration ◽  
Yellow Warbler ◽  
Undisturbed Site

Background Mangrove forests provide many ecosystem services, including the provision of habitat that supports avian biodiversity. However, hurricanes can knock down trees, alter hydrologic connectivity, and affect avian habitat. In 1995, Hurricanes Opal and Roxanne destroyed approximately 1,700 ha of mangrove forest in Laguna de Términos, Mexico. Since then, hydrological restoration has been implemented to protect the mangrove forest and its biodiversity. Methods Since avian communities are often considered biological indicators of ecosystem quality, avian diversity and species relative abundance were evaluated as indicators of mangrove restoration success by comparing undisturbed mangrove patches with those affected by the hurricanes. Using bird surveys, similarity analyses, and generalized linear models, we evaluated the effects of water quality variables and forest structure on the relative abundance and diversity of the avian community in disturbed, restored, and undisturbed mangrove patches. Results Higher bird species richness and relative abundances were found in disturbed and restored sites compared to the undisturbed site. After restoration, values of frequency of flooding, water temperature, tree density, and the number of tree species were more similar to that of the undisturbed site than to the values of the disturbed one. Such variables influenced the relative abundance of bird guilds in the different habitat conditions. Furthermore, some insectivorous bird species, such as the Yellow Warbler and Tropical Kingbird, were found to be similarly abundant in both undisturbed and restored sites, but absent or very low in occurrence at the disturbed site. Conclusions Collectively, our results strongly suggest that hydrologic restoration helps to enhance niche availability for different bird guilds, including water and canopy bird species. Our work can help inform management strategies that benefit avian communities in mangrove forests and wetland systems.

scholarly journals Mangrove Forest Landcover Changes in Coastal Vietnam: A Case Study from 1973 to 2020 in Thanh Hoa and Nghe An Provinces

Forests ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 637
Author(s):  
Huong Thi Thuy Nguyen ◽  
Giles E. S. Hardy ◽  
Tuat Van Le ◽  
Huy Quoc Nguyen ◽  
Hoang Huy Nguyen ◽  
...  
Keyword(s):  
Mangrove Forest ◽  
Monsoon Season ◽  
Coastal Development ◽  
Northern Coast ◽  
Mangrove Forests ◽  
Visual Interpretation ◽  
Mangrove Restoration ◽  
Coast Of Vietnam ◽  
Landsat Satellite

Mangrove forests can ameliorate the impacts of typhoons and storms, but their extent is threatened by coastal development. The northern coast of Vietnam is especially vulnerable as typhoons frequently hit it during the monsoon season. However, temporal change information in mangrove cover distribution in this region is incomplete. Therefore, this study was undertaken to detect change in the spatial distribution of mangroves in Thanh Hoa and Nghe An provinces and identify reasons for the cover change. Landsat satellite images from 1973 to 2020 were analyzed using the NDVI method combined with visual interpretation to detect mangrove area change. Six LULC classes were categorized: mangrove forest, other forests, aquaculture, other land use, mudflat, and water. The mangrove cover in Nghe An province was estimated to be 66.5 ha in 1973 and increased to 323.0 ha in 2020. Mangrove cover in Thanh Hoa province was 366.1 ha in 1973, decreased to 61.7 ha in 1995, and rose to 791.1 ha in 2020. Aquaculture was the main reason for the loss of mangroves in both provinces. Overall, the percentage of mangrove loss from aquaculture was 42.5% for Nghe An province and 60.1% for Thanh Hoa province. Mangrove restoration efforts have contributed significantly to mangrove cover, with more than 1300 ha being planted by 2020. This study reveals that improving mangrove restoration success remains a challenge for these provinces, and further refinement of engineering techniques is needed to improve restoration outcomes.

scholarly journals Peranan Restorasi Hutan dalam Konservasi Jenis Mangrove di Pesisir Timur Sumatera Utara

2018 ◽  
Vol 1 (2) ◽  
pp. 162-168
Author(s):  
Rizka Amelia ◽  
Onrizal Onrizal ◽  
Nurdin Sulistiyono
Keyword(s):  
Mangrove Forest ◽  
Buffer Zone ◽  
Forest Composition ◽  
Stand Age ◽  
Secondary Forests ◽  
Mangrove Forests ◽  
Mangrove Species ◽  
Mangrove Restoration ◽  
Wetland Resource ◽  
North Sumatra

Hutan mangrove merupakan sumber daya lahan basah yang berfungsi sebagai penyangga kehidupan. Namun demikian, dalam beberapa dekade terakhir, hutan mangrove banyak yang rusak atau hilang, terutama akibat konversi mangrove menjadi lahan tambak. Kegiatan restorasi mangrove pada lahan bekas tambak telah mulai dilakukan dalam beberapa tahun terakhir. Peneltian ini bertujuan untuk mengukur pemulihan jenis-jenis mangrove melalui kegiatan restorasi mangrove pada lahan bekas tambak serta mengetahui komposisi jenis hutan mangrove hasil restorasi dimaksud di pesisir timur Sumatera Utara. Sebanyak 30 plot contoh yang masing masing berukuran 10 m x 10 m telah dibangun di setiap umur tegakan (5-9 tahun) dan hutan sekunder. Seluruh pohon yang berdiameter (DBH) ≥ 2 cm di dalam plot contoh diidentifikasi dan diukur diamaternya. Secara keseluruhan, terdapat 14 jenis mangrove pada seluruh plot contoh atau setara dengan 42,42% dari seluruh jenis tumbuhan mangrove sejati yang terdapat di Indonesia. Dengan demikian, restorasi mangrove mampu memulihkan keanekaragaman jenis mangrove, sehingga restorasi mangrove pada lahan bekas tambak perlu dipromosikan dalam upaya mengembalikan berbagai fungsi mangrove bagi ketahanan masyarakat dan sumberdaya pesisir.   Mangrove forest is a wetland resource that serves as a buffer zone. However, in the past few decades, many mangrove forests have been damaged or converted, mainly into ponds. To address such a problem, mangrove restoration activities have begun in recent years. This research aims to measure the recovery of mangrove species on ex-pond land and indicate the type of mangrove forest composition through the mangrove restoration activities in North Sumatra. A total of 30 sample plots, with 10 m x 10 m size each, have been built at each stand age (5-9 years) and secondary forests. All trees with a diameter (DBH) ≥ 2 cm in the sample plot are identified and measured. The results show that overall, there are 14 types of mangroves in all sample plots, equivalent to 42.42% of all pure mangrove species in Indonesia. Therefore, it can be concluded that the activities can restore the diversity of mangrove species, so that needs to be promoted as an effort to restore the various functions of mangroves to resilience the community and coastal resources.

scholarly journals KEANEKARAGAMAN SPESIES BURUNG DI HUTAN MANGROVE PULAU KELAGIAN BESAR PROVINSI LAMPUNG

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Memo Dinda Nugraha ◽  
Agus Setiawan ◽  
Dian Iswandaru ◽  
Yulia Rahma Fitriana
Keyword(s):  
Mangrove Forest ◽  
Local Community ◽  
Diversity Index ◽  
Bird Species ◽  
Index Formula ◽  
Mangrove Forests ◽  
Xema Sabini ◽  
Index Value ◽  
Bird Species Diversity ◽  
White Belly

The existence of mangrove forests is very important in an area because as a habitat for various types of wildlife, especially birds. This study aims to determine the diversity of bird species in the Kelagian Besar Mangrove Forest, Lampung Province. Data on bird species diversity was obtained by the IPA (Indices Ponctual Abundance) method. Data collection of bird species by recording the type and number of individual birds found. Species identification also uses the method of bird recognition directly by people who know the birds in the area such as the local community or an expert on birds. Data obtained in the field are then analyzed using the Shanon-Winner diversity index formula. The results found 27 species of birds from 21 families with a total of 741 individual birds in the Kelagian Besar Mangrove Forest. While the diversity index value is 2.26 with medium index criteria. There are 8 protected bird species, namely the black-necked darautaut (Sterna sumatrana), the white-wing daralaut (Chlidonias leucopterus), the oyster daralaut (Gelochelidon nilotica), the white belly eagle (Haliaeetus leucogaste), the brontok eagle (Spizaetus cirrhatus), oyster belly Rhipidura javanica), sabine seagulls (Xema sabini), and large fissures (Fregata minor).

scholarly journals KOMUNITAS AVIFAUNA DI SEPANJANG ALIRAN ANAK SUNGAI WAILAWA DESA TAWIRI KECAMATAN TELUK AMBON, KOTA AMBON

2018 ◽  
Vol 6 (2) ◽  
pp. 177
Author(s):  
Andri Tuhumury
Keyword(s):  
Mangrove Forest ◽  
Diversity Index ◽  
Mixed Forest ◽  
Bird Species ◽  
Similarity Index ◽  
Bird Communities ◽  
Mangrove Forests ◽  
Point Count ◽  
Wiener Diversity Index ◽  
Foraging Guild

The study was conducted in April 2017, located along the Wailawa watercourses, Tawiri Village, Ambon. The method applied in these studies were Point Count, while data analysis using Shannon-Wiener Diversity Index, Evenness Index, Domination Index, Similarity Index, and Guild Composition. The results showed that the number of bird species found along Wailawa watercourse were 28 species of 25 genera, 17 families, and 8 orders. The diversity of bird species is moderate (H ‘= 2,54). The bird species similarity analysis resulted in three bird communities, including: (1) bird communities in mangrove forest, estuaries with grass vegetation, (2) bird communities in garden and settlement habitats, and (3) bird communities in mixed forest habitat. Mangrove forest and estuaries have the highest species similarities (0,63). Estuaries and mix gardens have the lowest bird similarities (0,05). Bird communities in mangrove forests and estuaries are heterogeneous because they have more species with a more equitable distribution of species abundance, while in other habitat, their are homogenous because of relatively have a low species diversity with uneven distribution of species abundance.Penelitian ini bertujuan menganalisis komunitas burung, meliputi kekayaan jenis, keanekaragaman jenis, kelimpahan relatif, kemerataan jenis, foraging guild, serta kesamaan jenis. Penelitian dilakukan pada bulan April 2017, berlokasi di sepanjang Anak Sungai Wailawa, Desa Tawiri, Kota Ambon. Metode pengambilan data adalah metode point count, sedangkan analisis data menggunakan Indeks Keanekaragaman Shannon-Wiener, Indeks Kemerataan Jenis Evennes, Indeks Dominasi Jenis, Indeks Kesamaan Jenis, dan Foraging guild. Hasil penelitian menunjukkan jumlah jenis burung yang ditemukan sebanyak 28 jenis dari 25 genus, 17 famili, dan 8 ordo. Keanekaragaman jenis burung tergolong sedang (H’ = 2,54). Hasil analisis tingkat kesamaan komunitas menghasilkan tiga komunitas burung, meliputi : (1) komunitas burung di hutan mangrove-muara sungai bervegetasi rumput, (2) komunitas burung di kebun dan permukiman, serta (3) komunitas burung di kebun campur. Hutan mangrove dan muara sungai memiliki kesamaan jenis burung tertinggi, yakni 0,63. Muara sungai dan kebun campur memiliki kesamaan jenis burung terendah, yakni 0,05. Komunitas burung di hutan mangrove dan muara sungai adalah komunitas heterogen karena memiliki lebih banyak spesies dengan distribusi kelimpahan spesies yang lebih merata, sedangkan komunitas burung pada tipe habitat lainnya adalah komunitas homogen karena keragaman jenis relatif rendah dan distribusi kelimpahan spesies tidak merata.

scholarly journals A Seven-Year Comparison of Relative-Abundance and Distance-Sampling Methods

The Auk ◽  
2003 ◽  
Vol 120 (4) ◽  
pp. 1013-1028 ◽  
Author(s):  
Russell E. Norvell ◽  
Frank P. Howe ◽  
Jimmie R. Parrish
Keyword(s):  
Relative Abundance ◽  
Large Scale ◽  
Sampling Methods ◽  
Distance Sampling ◽  
Bird Species ◽  
Self Assessment ◽  
Yellow Warbler ◽  
Point Count ◽  
Riparian Birds ◽  
Bullock’S Oriole

AbstractWe used data from statewide surveys of riparian birds in Utah, 1992–1998, to compare relative-abundance and distance-sampling methods. By generating relative-abundance indices with point-count methods and density with point-transect sampling methods, we examined whether the assumptions underlying each method were met during field surveys for four bird species (Brown-headed Cowbird [Molothrus ater], Bullock's Oriole [Icterus bullockii], Warbling Vireo [Vireo gilvus], and Yellow Warbler [Dendroica petechia]). Point-count methods failed to reasonably meet the fundamental assumption of constant proportionality, with estimated detectability varying 3- to 5-fold despite the use of widely accepted and well-standardized methods. Population trends based on relative abundance were subsequently unstable, often varying in both magnitude and direction with the survey plot radius used (25 m, 50 m, or unlimited distance). Distance-sampling methods appeared to meet critical assumptions, were robust to assumption violations, allowed methodological self-assessment, and were demonstrably efficient in a large-scale, multispecies survey setting. Our data show surveys of birds without estimations of detectability are likely biased because the assumption of constant proportionality is violated to a degree that precludes strict inference and may confound trend analyses.

scholarly journals Community-based conservation through stakeholder collaboration in the Essential Ecosystem Area (EEA) of Kao, North Halmahera Regency

2021 ◽  
Vol 886 (1) ◽  
pp. 012026
Author(s):  
Radios Simanjuntak ◽  
Benny Aladin Siregar ◽  
Fiktor Imanuel Boleu
Keyword(s):  
Mangrove Forest ◽  
Bird Species ◽  
Forest Products ◽  
Mangrove Forests ◽  
Community Based ◽  
Mangrove Species ◽  
Stakeholder Collaboration ◽  
The North ◽  
Community Based Conservation ◽  
The Government

Abstract Mangrove forest in Kao Village, North Halmahera Regency, North Maluku Province, is a Key Biodiversity Area. Since 2017, the community has been protecting mangrove forests through Kao Village Regulation No.03/2007. In 2020, through the collaboration between stakeholders from universities, NGOs and the government, the Kao mangrove forest area of 300.92 Ha was designated as an Essential Ecosystem Area (EEA) based on the North Halmahera Regent Decree No.078/102/HU/2020. This study describes the biodiversity and the community-based conservation through stakeholder collaboration in the EEA of Kao. The study found that there are 13 mangrove species and 56 bird species, of which 10 are protected species. In 2020, the community has built a mangrove nursery and rehabilitated 8 ha of degraded mangrove forest with the participation of about 70 people. Since the establishment of EEA, the community has stopped hunting for eggs of the endemic moluccan scrubfowl (Eulipoa wallacei) and is trying to increase its population through semi-natural hatching on the beach. The community has also learned to use non-timber mangrove forest products and ecotourism through the support of stakeholders.

Economic value analysis of mangrove forest ecosystems in Sorong, West Papua Province

2014 ◽  
pp. 39
Author(s):  
Roger R Tabalessy
Keyword(s):  
Mangrove Forest ◽  
Economic Value ◽  
Forest Degradation ◽  
Primary Data ◽  
Mangrove Forests ◽  
Value Analysis ◽  
Human Needs ◽  
The People ◽  
West Papua ◽  
Mangrove Wood

Coastal areas can either meet the human needs or give great contribution to the development. However, rapid infrastrural development in Sorong, west Papua, has been followed by high demand for mangrove timber and caused mangrove forest degradation due to exploitation. This exploitation could also result from high economic value of the mangrove timber. This study was done to analyze the economic value of mangrove wood utilized by the people to support the development process in Sorong. This study used primary data obtained through interviews and the economic value calculation of mangrove forests. It found that Sorong had mangrove economic value of IDR 165,197,833, 491. Wilayah pesisir selain dapat memenuhi kebutuhan hidup manusia juga memberikan kontribusi yang besar bagi pembangunan. Cepatnya pembangunan infrastruktur di Kota Sorong diikuti pula dengan tingginya permintaan akan kayu mangrove dan menyebabkan terjadinya degradasi hutan mangrove akibat eksploitasi. Eksploitasi ini disebabkan juga akibat kayu mangrove memiliki nilai ekonomi. Penelitian yang dilakukan ini bertujuan untuk menganalisis nilai ekonomi kayu mangrove yang dimanfaatkan oleh masyarakat Kota Sorong dalam proses menunjang pembangunan. Penelitian ini menggunakkan data primer yang diperoleh melalui hasil wawancara dan perhitungan nilai ekonomi hutan mangrove. Hasil penelitian ini menunjukkan nilai ekonomi ekosistem hutan mangrove yang berada di Kota Sorong adalah Rp165.197.833.491.

scholarly journals Assessing the Natural Recovery of Mangroves after Human Disturbance Using Neural Network Classification and Sentinel-2 Imagery in Wunbaik Mangrove Forest, Myanmar

2020 ◽  
Vol 13 (1) ◽  
pp. 52
Author(s):  
Win Sithu Maung ◽  
Jun Sasaki
Keyword(s):  
Neural Network ◽  
Change Detection ◽  
Transfer Learning ◽  
Mangrove Forest ◽  
Kappa Coefficient ◽  
Mangrove Forests ◽  
Ann Model ◽  
Shrimp Ponds ◽  
Natural Recovery ◽  
Sentinel 2

In this study, we examined the natural recovery of mangroves in abandoned shrimp ponds located in the Wunbaik Mangrove Forest (WMF) in Myanmar using artificial neural network (ANN) classification and a change detection approach with Sentinel-2 satellite images. In 2020, we conducted various experiments related to mangrove classification by tuning input features and hyper-parameters. The selected ANN model was used with a transfer learning approach to predict the mangrove distribution in 2015. Changes were detected using classification results from 2015 and 2020. Naturally recovering mangroves were identified by extracting the change detection results of three abandoned shrimp ponds selected during field investigation. The proposed method yielded an overall accuracy of 95.98%, a kappa coefficient of 0.92, mangrove and non-mangrove precisions of 0.95 and 0.98, respectively, recalls of 0.96, and F1 scores of 0.96 for the 2020 classification. For the 2015 prediction, transfer learning improved model performance, resulting in an overall accuracy of 97.20%, a kappa coefficient of 0.94, mangrove and non-mangrove precisions of 0.98 and 0.96, respectively, recalls of 0.98 and 0.97, and F1 scores of 0.96. The change detection results showed that mangrove forests in the WMF slightly decreased between 2015 and 2020. Naturally recovering mangroves were detected at approximately 50% of each abandoned site within a short abandonment period. This study demonstrates that the ANN method using Sentinel-2 imagery and topographic and canopy height data can produce reliable results for mangrove classification. The natural recovery of mangroves presents a valuable opportunity for mangrove rehabilitation at human-disturbed sites in the WMF.

scholarly journals Factors affecting presence and relative abundance of the Endangered volcano rabbit Romerolagus diazi, a habitat specialist

Oryx ◽  
2021 ◽  
pp. 1-10
Author(s):  
Felipe Osuna ◽  
Roger Guevara ◽  
Enrique Martínez-Meyer ◽  
Raúl Alcalá ◽  
Alejandro Espinosa de los Monteros
Keyword(s):  
Sierra Nevada ◽  
Relative Abundance ◽  
Linear Models ◽  
Cattle Grazing ◽  
Patch Occupancy ◽  
Factors Affecting ◽  
Rock Cover ◽  
Volcanic Fields ◽  
Mountain Grasslands ◽  
Insight Into

Abstract Habitat specialists are particularly vulnerable to extinction when habitat conditions are altered. Information on the habitat use of such species is thus important because it provides insight into factors that influence distribution and abundance, which is crucial for conservation. Here, we aimed to identify factors that influence the patterns of presence and abundance of the Endangered volcano rabbit Romerolagus diazi, a rare leporid with a patchy distribution. Through exhaustive sampling of its range in the Sierra Chichinautzin and Sierra Nevada volcanic fields, Mexico, and using generalized linear models, we found that the probability of patch occupancy was higher where bunchgrass cover exceeded 75%, rock cover exceeded 5%, no cattle grazing was observed and human settlements were at least 7 km away. Patches with greater relative abundance were those with similar characteristics, but located at elevations > 3,600 m, and with rock cover < 15%. Cattle grazing was identified as a major threat to local populations of the volcano rabbit, particularly in the Sierra Chichinautzin. Because of the significance of bunchgrasses for this species, the protection of the mountain grasslands is required in both volcanic fields.

scholarly journals Using Bioacoustics to Examine Vocal Phenology of Neotropical Migratory Birds on a Wild and Scenic River in Arizona

Birds ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 261-274
Author(s):  
Heather L. Bateman ◽  
Sidney B. Riddle ◽  
Erin S. Cubley
Keyword(s):  
Sonoran Desert ◽  
Migratory Birds ◽  
Riparian Forest ◽  
Bird Species ◽  
Migratory Bird ◽  
Bird Diversity ◽  
Yellow Warbler ◽  
Habitat Features ◽  
The Usa ◽  
Vocal Activity

Passive acoustic recorders have been used successfully as automated survey tools to detect terrestrial wildlife. However, few studies have monitored Neotropical migratory bird use of riparian forest habitat using this technology. Within dryland ecosystems, the forests along rivers support high bird diversity. Many bird species of conservation concern require these floodplain forest habitats for foraging, migration stop-overs, and breeding. Few studies have explored the use of acoustic records in riverine systems designated for conservation for their natural resource value via the Wild and Scenic Rivers Act in the USA. Using acoustic recorders, we document vocal activity of four riparian-obligate species (Bell’s Vireo, Vireo bellii; Summer Tanager, Piranga rubra; Yellow Warbler, Setophaga petechial; and Yellow-billed Cuckoo, Coccyzus americanus) to determine species occurrence along a Wild and Scenic River. We established three study reaches along the perennial Lower Verde River, in the Sonoran Desert of central Arizona, USA. Nine acoustic recorders were used over the period of 80–120 days during the summer of 2018. We measured vegetation composition and structure in 100 m2 plots paired with acoustic recorders. Visualizing vocal activity showed that three species were calling and singing at each reach; whereas, one species, the cuckoo, had fewer recordings and occurred later in the summer. We demonstrate the utility of acoustic monitoring even when applied to rare birds in complex riparian habitats. This information is important for land management and conservation efforts concerning these species of interest and identifying important habitat features in Southwestern US riparian woodlands.

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